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en.wikipedia.org/wiki/Noble_gas

The noble gases make up a group of chemical elements with similar properties; under standard .... The noble gases up to xenon have multiple stable isotopes. ... The noble gas atoms, like atoms in most groups, increase steadily in atomic .... However, due to the high radioactivity and short half-life of radon isotopes, only a  ...

www.encyclopedia.com/science-and-technology/chemistry/compounds-and-elements/noble-gases

Get information, facts, and pictures about Noble gases at Encyclopedia.com. ... Since that time, numerous compounds of xenon with other elements, most notably ... One of the gases was helium—the first confirmation that the element existed on .... Because argon-40 is formed by the radioactive decay of a potassium isotope, ...

www.britannica.com/science/noble-gas

noble gas: The seven elements—helium, neon, argon, krypton, xenon, radon, and ... Radon usually is isolated as a product of the radioactive decomposition of ... radioactive isotopes (mass numbers), 5–10, 16–19, 23–34, 30–35, 37, 39, 41–  ...

www.chemistryexplained.com/elements/T-Z/Xenon.html

Xenon is a noble gas. The term noble gas is used to describe the elements in Group 18 (VIIIA) of the periodic table. ... Mostly, it is used to fill specialized lamps. SYMBOL Xe ... Isotopes. Nine naturally occurring isotopes of xenon exist. ... Two radioactive isotopes of xenon—xenon-127 and xenon-133—are used in medicine.

web.sahra.arizona.edu/programs/isotopes/noble.html

The radioactive isotopes of argon and krypton and the stable isotopes of ... Most of the noble gases have been in the earth's atmosphere since the earth formed.

onlinelibrary.wiley.com/doi/10.1029/JB076i017p04076/pdf

Jun 10, 1971 ... fallen meteorites, Lost City and Murchison; noble-gas isot.opic abundances ... netic phase contained mostly iron-nickel with ... sult of radioactive decay (•He and •шAr) and of .... 2•Ne, S6Ar, and 4шAr from both Ucera analyses; all neon isotopes and 4шAr .... An obvious degree of uncertainty exists in these.

www.livescience.com/29023-argon.html

Feb 20, 2015 ... (Isotopes of an element have varying numbers of neutrons in the nucleus.) ... Most common isotopes: Ar-40 (99.6035 percent natural abundance), Ar-40 ( 0.0629 ... The first hint of argon's existence came in 1785, when British scientist ... They made this discovery by injecting argon and other noble gas tracers ...

www.docbrown.info/page03/Noble_Gases.htm

The Group 0 NOBLE GASES consist of helium, neon, argon, krypton, xenon and radioactive radon. ... At the bottom of Group 0 is radioactive noble gas element radon (Rn) which is not shown. ... The noble gases form 1% of air, and most of this is argon. ... The noble gases exist as single atoms, that is they are ' monatomic ...

www.livescience.com/37504-facts-about-xenon.html

Nov 16, 2016 ... Pronounced "ZEE-non," this element is a gas primarily used in light manufacturing. Xenon is one of the inert or noble gases and is odorless, colorless, tasteless ... Natural xenon has nine stable isotopes and 20 unstable isotopes. ... It is used in nuclear energy plants and for filling television and radio tubes.